Numbness in the right hand and right foot is mainly due to two diseases: the first one, abnormalities in the brain, mainly cerebral infarction, cerebral hemorrhage and brain tumor on the left side of the brain, will stimulate and squeeze the cells of the brain, resulting in a decline in brain function, which will manifest as numbness in the right limb. Some of them also represent the precursor of stroke, which is the manifestation before the onset of cerebral infarction and cerebral hemorrhage. The second type, disc herniation. After a herniated disc in the right side of the cervical spine, it may compress the nerve roots and numbness in the right hand may occur. If a lumbar disc herniation forms in the lumbar spine and presses on the nerve root on the right side, numbness in the right foot will also occur. Therefore, when numbness in the right hand and right foot occurs, the cervical spine and lumbar spine should also be checked to avoid any omission.